diff --git a/tools.go b/tools.go
index f6b722d..6950ac0 100644
--- a/tools.go
+++ b/tools.go
@@ -42,7 +42,7 @@ var (
 )
 
 func (v Version) Register() {
-	versions[v.Package] = v
+	Versions[v.Package] = v
 }
 
 func (vMap versionMap) Json() ([]byte, error) {